The ship you choose is basically everything
I always found it funny when people dropped crazy money on a suite on one of the massive mainstream ships. Sure, your room is huge. But the second you walk out your cabin door, you are right back in the general population with thousands of other people. You're still going to hear noise at the main pool, and you're still going to spend ten minutes standing around waiting for an elevator after a show.
Personally, if I want actual silence, I’d look at something like Viking. They don't allow kids at all. It’s a very specific crowd paying a premium just so they don't have to listen to tantrums during dinner. Other premium lines have better dining options, but you still end up dealing with the morning buffet rush. I've never understood the logic of paying thousands of dollars for a relaxing vacation only to spend your mornings fighting fifty other people for tongs at the omelet station.
The cabin is where things get interesting
This is where I think people get cruises wrong. Some try to be cheap and book an inside cabin to save some money, figuring they’ll only be in the room to sleep.
An inside cabin has no windows. You wake up at 8 AM and it's pitch black. You wake up at 2 PM and it's pitch black. I’ve heard of people doing this on a two-week route and becoming completely miserable by day three because they felt trapped.
The balcony upgrade is one of the few things that is actually worth the money. If you are sailing past a glacier in Alaska, the public viewing decks are going to be completely packed. You end up wedged between dozens of people with massive cameras, freezing in the wind just to see the ice. Having your own balcony means you can just step outside in a bathrobe for ten minutes and then go back to bed.

The itinerary completely dictates your energy level
The Mediterranean is usually the first route people book, and they treat it like a relaxing vacation. It isn't. You dock in a new country at 7 AM, spend nine hours walking around ancient ruins in the heat, and drag yourself back to the ship with destroyed feet. You basically need a vacation to recover from it.
Alaska is completely different. It is visually stunning, but people almost always underestimate the weather. I’ve seen people from warm climates pack nothing but light sweaters for a glacier cruise in late September. They end up having to drop several hundred dollars in the ship's boutique just to buy a fleece jacket so they can stand outside.
The Caribbean is the route you take when you just want a break. You leave Florida, sit on a beach, and come back.
Then there's the money nobody talks about
Cruise lines are masters at advertising a base fare that looks reasonable. What they don't highlight is the onboard spending.
I’ve seen people underestimate drink costs more times than I can count. That premium alcohol package looks expensive until you start adding up individual cocktails by the pool. A tab can easily hit well over a thousand dollars by the end of the week.
And then there's the Wi-Fi. You are paying for a connection that is bouncing off a satellite in space. I never understood why people expect the internet to work exactly like it does in their living room. You aren't going to be streaming live football games in high definition while sailing through a fjord. You're lucky if you can check your email without timing out.
The whole shore excursion system is something people constantly misunderstand
The reality of a port day is just standing in line. The second the ship docks, three thousand people all rush the exit at the exact same time. You usually spend the first forty-five minutes of your morning wedged onto a hot stairwell, staring at the back of someone's head while you wait for the security doors to finally open.
I’ve seen people spend a couple hundred dollars a person for an official cruise line excursion, thinking it’s going to be this exclusive VIP tour. What they actually get is half an hour standing in the sun waiting for a numbered sticker, followed by an entire afternoon sitting on a hot bus waiting for stragglers who couldn't find their way back from the gift shop.
I always just walk past the tour buses and hand a hundred dollar bill to a local cab driver at the port. They'll take you wherever you want to go, it costs half as much as the official excursion, and you don't have to spend your afternoon babysitting three dozen strangers.
And nobody tells you how stressful dinner can be
The food on luxury lines is usually great, but the actual logistics of eating can be incredibly annoying. Unless you aggressively book your dining times months in advance, you get stuck with whatever is left over. I've known people who paid premium fares only to realize their assigned dinner time was 5:15 PM every single night. You basically have to stop whatever you're doing in the middle of the afternoon to go get dressed for dinner just so you don't miss your slot.
The alternative is showing up at 8 PM without a reservation and standing on a staircase holding a restaurant pager, just staring at the hostess stand for forty minutes hoping someone cancels.
And yes, seasickness is still a thing
Modern ships have massive stabilizers. Most of the time, it feels like you are walking in a regular hotel. But if you hit a rough storm system, the boat is going to sway.
I've never understood the vanity around motion sickness patches. People will literally risk spending three days puking in a tiny cabin bathroom just because they don't want a little round sticker showing behind their ear in their Instagram pictures.
And really, that’s the reality of the whole industry. You can pay as much as you want for the ticket, but money doesn't stop the boat from rocking, and it doesn't make the other three thousand passengers disappear.